Paper Title:
Negative Thermal Expansion of Gd2Fe16.5Cr0.5 Compound with Th2Ni17-Type Structure
  Abstract

The thermal expansion and the Curie temperature of Gd2Fe16.5Cr0.5 compound have been investigated by means of x-ray diffraction and magnetization measurements. The result shows that the Gd2Fe16.5Cr0.5 compound annealed at 1243°C has a hexagonal Th2Ni17-type structure. Cr atom substituting for Fe atom can increase the Curie temperature obviously. In magnetic state, an anisotropic anomolous thermal expansion was observed. Along the c-axis, the average linear thermal expansion coefficient αc=-2.79×10-6/K in the temperature range 294-472K, and αc =-3.09×10-5/K in 472-592K. Along the a-axis, the average linear thermal expansion coefficient αa =9.22×10-6/K in 294-552K, and αa =-1.41×10-5/K in 552-592K. In the temperature range 472-592K, the average volume thermal expansion coefficient αv =-2.14×10-5/K. The mechanism of the thermal expansion anomaly of Gd2Fe16.5Cr0.5 compound was discussed in this paper.

  Info
Periodical
Advanced Materials Research (Volumes 299-300)
Edited by
Jianzhong Wang and Jingang Qi
Pages
47-50
DOI
10.4028/www.scientific.net/AMR.299-300.47
Citation
Y. M. Hao, F. F. Liang, X. H. He, W. Y. Zhao, Y. T. Qin, F. Wang, "Negative Thermal Expansion of Gd2Fe16.5Cr0.5 Compound with Th2Ni17-Type Structure", Advanced Materials Research, Vols. 299-300, pp. 47-50, 2011
Online since
July 2011
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$32.00
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